public class Copy extends ElementCreator
inheritNamespaces, onEmptycontent, preservingTypesEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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Copy(Expression select,
boolean selectSpecified,
boolean copyNamespaces,
boolean inheritNamespaces,
SchemaType schemaType,
int validation)
Create a shallow copy instruction
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| Modifier and Type | Method and Description |
|---|---|
Expression |
copy()
Copy an expression.
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Item |
evaluateItem(XPathContext context)
Evaluate as an expression.
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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NamespaceBinding[] |
getActiveNamespaces()
Callback to get a list of the intrinsic namespaces that need to be generated for the element.
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NodeName |
getElementName(XPathContext context,
NodeInfo copiedNode)
Callback from ElementCreator when constructing an element
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the Copy expression
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int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes
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int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on.
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ItemType |
getItemType(TypeHierarchy th)
Get the item type of the result of this instruction.
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String |
getNewBaseURI(XPathContext context,
NodeInfo copiedNode)
Get the base URI of a copied element node (the base URI is retained in the new copy)
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Expression |
getSelectExpression()
Get the expression that selects the node or other item to be copied
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int |
getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
Get the "sweep" of this expression as defined in the W3C streamability specifications.
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CopyAdjunct |
getStreamingAdjunct()
Get a class that supports streamed evaluation of this expression
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boolean |
isCopyNamespaces()
Ask whether namespace nodes are to be copied (in the case of an element)
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boolean |
isSelectSpecified()
Ask whether the select attribute was explicitly specified
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Iterator<SubExpressionInfo> |
iterateSubExpressionInfo()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
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Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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void |
outputNamespaceNodes(XPathContext context,
Receiver receiver,
NodeName nameCode,
NodeInfo copiedNode)
Callback to output namespace nodes for the new element.
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TailCall |
processLeavingTail(XPathContext context)
Evaluate the instruction to produce a new element node.
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void |
processLeft(Stack<XPathContext> contextStack,
Stack<Object> state)
Process the first half of the instruction in streaming mode
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void |
processRight(Stack<XPathContext> contextStack,
Stack<Object> state)
Process the second half of the instruction in streaming mode
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protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites.
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression.
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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checkContentSequence, computeSpecialProperties, getCardinality, getImplementationMethod, getOnEmpty, isInheritNamespaces, iterateEvents, iterateEvents, processLeavingTail, setOnEmpty, suppressValidationaddToPathMap, computeCardinality, createsNewNodes, getBaseURI, getContentExpression, getSchemaType, getValidationAction, getValidationOptions, isLazyConstruction, isPreservingTypes, setBaseURI, setContentExpression, setLazyConstruction, setNoNeedToStrip, setValidationActionassembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, promoteadoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, toPattern, toStreamingPattern, toString, typeErrorclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitgetColumnNumber, getLineNumber, getPublicId, getSystemIdpublic Copy(Expression select, boolean selectSpecified, boolean copyNamespaces, boolean inheritNamespaces, SchemaType schemaType, int validation)
select - selects the node (or other item) to be copied. Never null.selectSpecified - true if the select attribute of xsl:copy was specified explicitly (in which
case the context for evaluating the body will change)copyNamespaces - true if namespace nodes are to be copied when copying an elementinheritNamespaces - true if child elements are to inherit the namespace nodes of their parentschemaType - the Schema type against which the content is to be validatedvalidation - the schema validation modepublic Expression getSelectExpression()
public boolean isSelectSpecified()
public boolean isCopyNamespaces()
public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify in class ElementCreatorvisitor - an expression visitorXPathException - if an error is discovered during expression rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck in class ElementCreatorvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression copy()
copy in class Expressionpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class ParentNodeConstructororiginal - the original subexpressionreplacement - the replacement subexpressionpublic int getIntrinsicDependencies()
getIntrinsicDependencies in class Expressionpublic int getInstructionNameCode()
getInstructionNameCode in class Instructionpublic Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class ElementCreatorpublic Iterator<SubExpressionInfo> iterateSubExpressionInfo()
iterateSubExpressionInfo in class ElementCreatorpublic ItemType getItemType(TypeHierarchy th)
getItemType in class ElementCreatorth - the type hierarchy cachepublic Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class ElementCreatorvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)protected void promoteInst(PromotionOffer offer) throws XPathException
ParentNodeConstructorpromoteInst in class ParentNodeConstructoroffer - The type of rewrite being offeredXPathException - if an error occurspublic NodeName getElementName(XPathContext context, NodeInfo copiedNode) throws XPathException
getElementName in class ElementCreatorcontext - XPath dynamic evaluation contextcopiedNode - the node being copiedXPathExceptionpublic String getNewBaseURI(XPathContext context, NodeInfo copiedNode)
getNewBaseURI in class ElementCreatorcontext - XPath dynamic evaluation contextcopiedNode - public void outputNamespaceNodes(XPathContext context, Receiver receiver, NodeName nameCode, NodeInfo copiedNode) throws XPathException
outputNamespaceNodes in class ElementCreatorcontext - The execution contextreceiver - the Receiver where the namespace nodes are to be writtennameCode - copiedNode - XPathExceptionpublic NamespaceBinding[] getActiveNamespaces() throws XPathException
getActiveNamespaces in class ElementCreatorXPathException - if an error occurspublic TailCall processLeavingTail(XPathContext context) throws XPathException
ElementCreatorprocessLeavingTail in interface TailCallReturnerprocessLeavingTail in class ElementCreatorcontext - XPath dynamic evaluation contextXPathException - if a dynamic error occurs during the evaluation
of the instructionpublic Item evaluateItem(XPathContext context) throws XPathException
evaluateItem in class ElementCreatorcontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic int getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
ExpressiongetStreamability in class ExpressionsyntacticContext - one of the values Expression.NAVIGATION_CONTEXT,
Expression.NODE_VALUE_CONTEXT, Expression.INHERITED_CONTEXT, Expression.INSPECTION_CONTEXTallowExtensions - if false, the definition of "guaranteed streamability" in the
W3C specification is used. If true, Saxon extensions are permitted, which make somereasons - the caller may supply a list, in which case the implementation may add to this
list a message explaining why the construct is not streamable, suitable for inclusion in an
error message.Expression.W3C_MOTIONLESS, Expression.W3C_CONSUMING,
Expression.W3C_GROUP_CONSUMING, Expression.W3C_FREE_RANGINGpublic CopyAdjunct getStreamingAdjunct()
getStreamingAdjunct in class ElementCreatorpublic void processLeft(Stack<XPathContext> contextStack, Stack<Object> state) throws XPathException
processLeft in interface DivisibleInstructionprocessLeft in class ElementCreatorcontextStack - the dynamic evaluation contextstate - a stack on which the instruction can save state information for use during the correspondingXPathException - if a dynamic error occurspublic void processRight(Stack<XPathContext> contextStack, Stack<Object> state) throws XPathException
processRight in interface DivisibleInstructionprocessRight in class ElementCreatorcontextStack - the stack of XPath context objects for the current execution statestate - a stack on which the instruction can save state information for use during the correspondingXPathException - if a dynamic error occurspublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structureCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.